Question

.4. Which of the following must be true of the structures of axons and muscle cells in order for
nerve impulses to stimulate muscle contraction? (1 point)
Axons and muscle cells must both have structures that make and secrete the same
small molecules.
Axons and muscle cells must both have receptors that recognize the same small
molecules.
Axons must have structures that make and secrete molecules, and muscle cells
must have receptors that recognize these molecules.
Muscle cells must have structures that make and secrete molecules, and axons

Answer 1

I think its C

Answer 2

ok thanks